PlumbingProduct Selection & Quality2MildHomeowner$ implied
Homeowner is confused about conflicting advice on required tankless water heater flow rate for a small house with 5 fixtures.
No simple, objective sizing tool that accounts for fixture count, household size, and local climate to recommend minimum GPM; plumber's advice conflicts with online product popularity.
39
0
Opp. Score
39
Severity
2Mild
Willingness to Pay
implied
Added
May 22, 2026
Workarounds Described
- 'every unit I see on amazon and Home Depot that have the most reviews/purchases are anywhere from 6.6-8.0'
- relies on plumber's advice despite conflicting with online data
Implied Software Gaps
- Water heater sizing calculator that accounts for local climate, fixture count, and household size
App Concept
FlowRater Pro
FlowRater Pro is a mobile app that calculates the minimum GPM for a tankless water heater based on fixture count, household size, and location. It provides a clear, unbiased recommendation and explains the reasoning, bridging the gap between plumber intuition and consumer research.
Key Features
- Input fixtures, household size, and zip code for climate adjustment
- Calculates minimum GPM with explanation
- Shows recommended units from major brands with purchase links
- Compare multiple scenarios (current vs future family size)
Target Users: Homeowners and DIYers in the US selecting a tankless water heater for single-family homes
Revenue Model: Freemium (basic sizing free) with $2.99 per detailed report or $9.99/year subscription for unlimited scenarios and brand comparison
Existing Solutions Mentioned
searching Amazon and Home Depot reviews
Part of App Idea
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